Don't include rev tree in credentials
Don't include rev tree in credentials

couch_query_servers:json_doc/1 adds the full revision
tree to the resulting EJSON object. This is not necessary
at all.
Detail noticed thanks to COUCHDB-1390.

fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb,fkaempfer/couchdb